This is quite an interesting area of scientific study, and there's a lot of info out there speculating on this :-)
blogs.sas.com/content/sastraining/2014/10/16/how-do-men-rate-women-on-dating-websites-part-2/
When you look at how men rate women on dating websites, their ratings average out more or less to produce a normal distribution, i.e. a bell curve (a few 1s, a few 10s, a lot of women in the middle). A very expected result, as most human characteristics follow this pattern.
When you look at how women rate men, something very different emerges. Women judge men much more harshly. Basically, in women's eyes, most men are below average. Which is a statistical impossibility, but it shows something interesting I think.
Women seem to be much more discriminating in their choices, than men (which is something I think we can all see, anecdotally). Evolutionary biologists suggest this evolved because, basically, the costs to women of picking the "wrong" mate are enormous, so they have evolved to be extremely choosy (relatively), and in effect to compete for the top 20% of men.
Hence the very asymmetrical experiences of men and women on dating sites. Women can't find a decent man amongst all the weirdos and dick pics. Most average men can't get anyone to talk to them at all.